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| Number | Title | Issue Date |
| 5225636 | Apparatus and method for digitizer point sampling and validation An apparatus and method for digitizer sampled point validation which compares charge and discharge voltages across a capacitive element within the digitizer or a filter coupled between the digitizer and an analog-to-digital convertor to accept or reject t... | 07/06/1993 |
| 5181030 | Input system including resistance film touch panel and pushed position detecting device An input system including a resistance film touch panel and a pushed position detecting device for detecting two-dimensional coordinates of a pushed position of a touch panel based on surface resistance values of resistance films, the system comprising a ... | 01/19/1993 |
| 5149919 | Stylus sensing system An improved stylus detection system for use on the surface of a display device. An overlay having horizontal and vertical transparent conductors is coupled to other elements of the systems through a bus having a minimal number of bus wires. A control proc... | 09/22/1992 |
| 5124509 | Digitizer with capacitive and inductive coupling A battery powered oscillator in a freely movable pointer drives a coil and a divider. A grid of spaced conductors in a base unit is inductively coupled to the coil. A conductive plate that lies parallel to the conductor grid capacitively couples the signa... | 06/23/1992 |
| 5041820 | Cursor device for a capacitive coupling tablet A cursor device for a capacitive coupling tablet used as a digitizer for inputting a figure or pattern. An index indicative of a coordinate position on a tablet to be input is displayed on a pane mounted on a window of a housing, and on the side opposite ... | 08/20/1991 |
| 4977397 | Touch-control computer house A touch-control mouse provides rapid and accurate control of the positioning of a cursor on a computer display screen, and includes a laminated touch-control film assembly, an aluminum supporting board, a press button switch set, a signal processing circu... | 12/11/1990 |
| 4806709 | Method of and apparatus for sensing the location, such as coordinates, of designated points on an electrically sensitive touch-screen surface A method and apparatus are disclosed for determining the location of a designated point on an electrically sensitive touch-screen surface while minimizing aberrations introduced by non-uniformity in the field applied to the surface, by attaching a plurali... | 02/21/1989 |
| 4631355 | Telautograph system The position (XY coordinate) of a pointed stylus on a conductive sheet is determined by injecting current from the stylus into the sheet and measuring the current responses at three or more spaced apart electrodes connected to the sheet.... | 12/23/1986 |
| 4616107 | Pattern input apparatus Disclosed is a pattern input apparatus in which an input pen is made to be in contact with a tablet having a matrix composed of sets of conductors disposed at intervals along coordinate axes, thereby applying hand writing information to an electronic comp... | 10/07/1986 |
| 4571454 | Coordinate position digitizing system A coordinate position digitizing system comprises a position determining plate having a plurality of first parallel strip electrodes provided on one surface of a insulating layer to form plural groups thereof each connected in common and a plurality of se... | 02/18/1986 |
| 4550221 | Touch sensitive control device A touch sensitive control device translates touch location into output signals. The device includes a substrate which supports first and second interleaved, closely spaced, nonoverlapping arrays of conductive plates. The plates are aligned in rows and col... | 10/29/1985 |
| 4520357 | Electroscopic information display and entry system with writing stylus Information is written into a matrix-addressed electroscopic display by means of a writing stylus having a magnetic tip, utilized to attract a moveable plate electrode in a selected one of the display matrix cells. A capacitance detector, connected to seq... | 05/28/1985 |
| 4482784 | Position determination device A position determining device has two perpendicular longitudinal magnetostrictive elements. A grid of a plurality of closed loop conductors has two parallel straight legs which form the grid. A flux producing element inductively coupled to at least one of... | 11/13/1984 |
| 4475235 | Signature verification sensor A sensor having a particular application in the field of signature verification is disclosed. In the presently preferred embodiment, two plates are disposed in a spaced apart relationship and constructed to provide a plurality of electrical capacitors. Pr... | 10/02/1984 |
| 4455452 | Touch activated controller for generating X-Y output information A touch activated control unit and system provides control information representative of, and in response to, movement of a person's finger along each of two axes defined on the unit. The control system includes a touch pad as part of the control unit. El... | 06/19/1984 |
| 4264903 | Capacitive touch control and display A control for use upon a solid panel, devoid of control shaft apertures, allows data entry by rotational positioning of a human member, such as one's finger, about a pattern of a plurality of interdigitated electrodes formed upon an interior surface of th... | 04/28/1981 |
| 4242676 | Interactive device for data input into an instrument of small dimensions The device according to the invention comprises a sensor formed by a plurality of capacitive or resistive electrodes. The user searches the symbol to be selected by displacing his finger on the sensor while looking at a control display unit. Any position ... | 12/30/1980 |
| 4194083 | Capacitively coupled tablet A capacitively coupled tablet for use with a probe comprises two sets of conductors spaced apart along coordinate axes to form a matrix, and an overlay disposed above the conductors and forming a plurality of key segments associated with the individual po... | 03/18/1980 |
| 4164622 | Graphical input apparatus for electrical equipment A graphical input tablet is disclosed in which a sheet of resistive material is stretched across a surface comprising parallel conductors on, but insulated from, a resistive layer. Currents are passed alternately through the resistive layer and means whic... | 08/14/1979 |
| 4149029 | Graphical input apparatus for electrical equipment A graphical input tablet is disclosed in which the lower surface of a sheet is spaced from the upper surface of a fixed member. Each or both surfaces are formed by parallel conductors but where only one surface is formed in this way the other surface is r... | 04/10/1979 |
| 4129747 | Human-machine interface apparatus A human-machine interface apparatus includes a first, or phase, surface with associated circuitry so devised that an alternating electrical field is created above the surface with its phase, relative to a fixed point on the surface, changing continuously ... | 12/12/1978 |
| 4087625 | Capacitive two dimensional tablet with single conductive layer A new capacitive tablet has a single layer in which electrodes provide capacitive coupling with a pen to produce signals that correspond to the X and Y dimensions of the position of the pen on the tablet. The electrodes in the single layer are in the form... | 05/02/1978 |
| 4071691 | Human-machine interface apparatus A human-machine interface apparatus includes a first, or phase, surface with associated circuitry so devised that an alternating electrical field is created above the surface with its phase, relative to a fixed point on the surface, changing continuously ... | 01/31/1978 |
| 3992579 | Tablet system with digital activation An improved tablet system is disclosed of the type having an array of X and Y dimension wires that are capacitively coupled to a pen that a user holds to the tablet to produce a position signal. Drivers are provided for individual wires to produce a selec... | 11/16/1976 |
